Verb: Texting while walking really slowly in no specific direction much to the annoyance of anyone behind you who is walking at a normal pace that are either blocked, or need to walk around you. Noun: twalker

Sorry I'm late, I got stuck behind a twalker
I need to quit twalking and pay attention to where I am going
I had to crawl through this twalker's legs to get past him/her
Sorry, I've been twalking in circles